﻿// -----------------------------------------------------------------------
// <copyright company="www.3WayWebdesign.de">
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
// 
// <author>Michael Morbach</author>
// <email>Michael@3waywebdesign.de</email>
// <web>http://www.3waywebdesign.de</web>
// ----------------------------------------------------------------------

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
using System.Windows.Markup;

namespace Tww.Wpf.Controls.Converters.Base
{

    #region Imports

    #endregion

    [MarkupExtensionReturnType(typeof (IValueConverter))]
    public abstract class MarkupConverter : MarkupExtension, IValueConverter
    {
        #region  - IValueConverter Members -

        object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            try
            {
                return Convert(value, targetType, parameter, culture);
            }
            catch
            {
                return DependencyProperty.UnsetValue;
            }
        }

        object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            try
            {
                return ConvertBack(value, targetType, parameter, culture);
            }
            catch
            {
                return DependencyProperty.UnsetValue;
            }
        }

        #endregion

        #region  - Methoden (öffentlich) -

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }

        #endregion

        #region  - Methoden (privat) -

        protected abstract object Convert(object value, Type targetType, object parameter, CultureInfo culture);
        protected abstract object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture);

        #endregion
    }
}